JPH0417262B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method of constructing a building frame in which the frame floor portion of the building is a concrete slab, and is particularly suitable for constructing a high-rise building or a super high-rise building.

[Conventional technology and its problems]

Even in high-rise buildings and super high-rise buildings, composite columns and unbonded breastless concrete slabs (hereinafter referred to as unbonded) are used instead of conventional steel-based frames.
Buildings with economical cross-sections have been designed using PC slabs (called PC slabs).

However, with the method of building the floors one by one starting from the lower floors, it takes time to assemble, dismantle, and move the formwork for pouring floor concrete, requires a lot of temporary materials, and requires a lot of man-hours. Waiting time becomes longer.

Furthermore, when constructing a flat slab structure for a low-rise building, a construction method is known in which several floors of slabs are formed above the ground and lifted up, but this method is difficult to apply to high-rise buildings.

This invention aims to solve the above-mentioned problems.

[Means for solving problems]

The construction method of this invention is to construct the floor frame 5 sequentially from the upper floor to the lower floor, first constructing the center core 1, then constructing the center core 1.
The external column steel frame 2 is raised to a predetermined height.

The center core 1 is a part where the elevator room, machine room, etc. are concentrated, and the concrete work of the wall part can be performed using the sliding form method or the jumping form method. Also, during construction, the column steel frame 2 will be connected to the center core 1 with a temporary horizontal brace 3 and then erected.

Next, a temporary stage 4 is assembled on top of the erected steel column 2 so as to surround the center core 1. The temporary stage 4 is composed of a steel frame 4a, a formwork 4b provided on the steel frame 4a, etc., and is made to be able to slide along the center core 1 and the column steel frame 2.

Next, after performing necessary reinforcing work on the temporary stage 4, floor concrete is poured, and the temporary stage 4 is lowered one floor at a time, and floor concrete for the lower floors is poured. Note that the slab formed on the temporary stage 4 is not limited to a flat slab, but may also be a beamed slab or the like.

As described above, a frame consisting of the center core 1, column steel frame 2, and floor frame 5 is formed, and when the column is a composite column such as a steel reinforced concrete column,
Next, reinforcement and concrete work will be carried out around the steel column 2.

In addition, if the building has many floors, the above work is divided into two or more heights, and the center core 1 is constructed in advance, the column steel frame 2 is erected, and the temporary stage 4 is used to move from the upper floor to the lower floor. The process of forming the floor frame 5 will be repeated.

〔Example〕

Next, the illustrated embodiment will be described.

Figure 5 is a plan view of the frame during construction, and Figure 6 is a cross-sectional perspective view showing the structure of the columns and floor. A floor frame 5 of unbonded PC slabs supported by composite columns made of steel-framed reinforced concrete is formed.

The floor frame 5 consists of a floor slab 5a portion and a beam 5b portion, and includes floor reinforcing bars 11 made of grid-like reinforcing bars, unbonded PC strands 12 in the form of catenary lines, and beam reinforcing bars 1.
3 is placed. Regarding the columns, column reinforcing bars 10 such as houb bars and spiral bars are arranged around the column steel frame 2 as vertical main bars and shear reinforcements, and concrete 7 is placed.

FIGS. 2 to 4 show an example of the temporary stage 4, in which a steel frame 4a is constructed of steel frames such as H-shaped steel, and a formwork 4b is provided on top of the steel frame 4a. As shown in FIGS. 3 and 4, fixing to the column steel frame 2 can be performed by bolting to connection plates attached to each floor. In addition, holes 8 for pouring concrete are formed in the formwork 4b of the temporary stage 4 at the column positions, and the column steel frames 2
It is now possible to form composite columns by combining steel and reinforced concrete.

7 to 9 show, as another embodiment, a case in which the temporary stage 4 is suspended by a center hole jack 14 installed at the top of the column steel frame 2. In this example, four center hole jacks 14 are prepared for each column steel frame 2,
A temporary frame 4a of a temporary stage 4 is suspended and supported via a wire rope 15.

When constructing the floor concrete, the temporary stage 4 is supported from below via jacks 17 on a receiving metal fitting 16 fixed to the column steel frame 2 with bolts or the like. To suspend the temporary stage 4, remove the bracket 16 and jack 17, gradually lower it by operating the center hole jack 14, and install it on the bracket 16 and jack 17 at the lower floor position. In addition, 18 in the figure is a wire guide.

In addition, the temporary stage 4 can also be supported by the center core 1 in the same way, by preparing embedded bolts for mounting brackets on the wall of the center core 1, and installing one or more center holes in the same way as the column steel frame 2 position. Using the jack 14, the lifting work is carried out at the same time.

FIGS. 1a to 1g show, as an example, the construction of a 48-story skyscraper using the present invention, and the work is carried out in the following steps.

The center core 1 is built in advance to a predetermined height by the sliding form method or the jumping form method (see Fig. 1a).

The steel column 2 will be erected and the temporary stage 4 will be assembled on the 18th floor (see Figure 1b). Pillar steel frame 2
will be connected to the center core 1 by temporary horizontal braces 3, and after the reinforcing work will be done on the 18th floor, the floor concrete will be poured.

The temporary stage 4 will be suspended one floor (see Figure 1c), and the floor frame 5 for the 17th floor will be constructed.

Thereafter, the same operation is repeated up to the fourth floor (see Figure 1 d). As for the low-rise part 6 of the fourth floor and below, erection is carried out from the bottom as in the past, and the work for this part is carried out in parallel. Also, during this time, the center core 1 is constructed further upward.

The column steel frame 2 will be raised upward, the dismantled temporary stage 4 will be moved to the floor position on the 32nd floor (see Figure 1 e), and the floor frame 5 will be constructed sequentially from the 32nd floor to the 19th floor. In parallel with this, the column center cores are sequentially cast upward from the fourth floor to form a composite column, and the construction of the center core 1 upward is completed.

The temporary stage 4 is moved to the roof slab position (see Figure 1 f), and the floor frame 5 is constructed sequentially up to the 33rd floor. At the same time, concrete pillars were poured starting from the 19th floor, and composite pillars were successively formed upwards.
Starting from the lower floor, we will begin installing the curtain wall upwards.

Complete all structural work (see Figure 1g),
Continue curtain wall work.

In the above work, it is assumed that the center core 1 will be built up one floor per day, the floor structure 5 will be built one floor in five days, and the pillar center core will be built one floor in two days. Therefore, the construction of the floor frame 5, the construction of the upper floor of the center core 1, the construction of the floor frame 5, the construction of column concrete on the lower floor, etc. can be performed in parallel.

[Effects of the Invention] Since the temporary stages assembled on the upper floors are used repeatedly, less temporary materials are required, which is economical.

Temporary stages can be moved without being dismantled, reducing the amount of work involved and saving labor.

Since there is less work to do while waiting for the concrete to harden, parallel work can significantly shorten the construction period.

[Brief explanation of drawings]

Figures 1 a to g are front views showing the construction procedure in one embodiment of the present invention, Figure 2 is a bottom view of the steel frame of the temporary stage, Figure 3 is a cross-sectional view of Figure 2, and Figure 4 is a 3 is a sectional view, FIG. 5 is a plan view during construction, FIG. 6 is a sectional perspective view showing the structure of the floor and pillars, and FIG. 7 is a front view of main parts in another embodiment. 8 is a side view, and FIG. 9 is a plan view. 1... Center core, 2... Steel column, 3... Horizontal brace, 4... Temporary stage, 4a... Steel frame, 4b... Formwork, 5... Floor frame, 5a...
...Floor slab, 5b... Beam, 6... Low-rise section, 7...
Column concrete, 8... Hole for pouring column concrete, 9... Connection plate, 10... Column reinforcing bar, 11
...Floor reinforcing bar, 12...Unbonded PC strand,
13...Beam reinforcing bar, 14...Center hole jack, 15...Wire rope, 16...Bracket fitting,
17... Jackpot, 18... Wire guide.

Claims (1)

[Claims] 1. The center core is constructed first, and then the column steel frames outside the center core are erected to a predetermined height, and a temporary stage that is slidable along the column steel frames is installed on the erected pillars. A building frame construction method characterized by assembling the upper part of a steel frame to surround a center core, and successively pouring floor concrete for lower floors on the temporary stage while lowering the temporary stage one floor at a time. 2. The building frame construction method according to claim 1, in which the steel columns are erected while being connected to the center core using temporary horizontal braces. 3. The temporary stage consists of a steel frame and a formwork provided on the steel frame.
The method of constructing the structure of a building as described in paragraph 2 or paragraph 2.